期刊
MATERIALS ADVANCES
卷 3, 期 10, 页码 4268-4277出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ma00357k
关键词
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资金
- National Natural Science Foundation of China [22075290, 21972068, 21776292]
- Beijing Natural Science Foundation [Z200012]
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences [MPCS-2021-A-05]
- Nanjing IPE Institute of Green Manufacturing Industry [E0010725]
The activity of Pt catalysts for the electro-oxidation of methanol can be greatly enhanced by coupling the electron effect with morphological engineering. The P doping not only changes the electron density around Pt atoms, but also alters the original morphology of the alloy precursors. The as-prepared ternary Pt3CoPn nanoparticles with branched morphologies exhibit high activity for methanol oxidation.
The activity of Pt catalysts for the electro-oxidation of methanol can be greatly enhanced by coupling the electron effect with morphological engineering. Herein, we report the use of bimetallic Pt-Co alloys with different molar ratios/morphologies as precursors for P doping to prepare high-efficiency electrocatalysts for the methanol oxidation reaction. We will demonstrate that the P doping could not only change the electron density around Pt atoms, but also significantly alter the original morphology of the alloy precursors. The strong electron affinity of P decreases the electron cloud density around Pt atoms, favorable for weakening the adsorption of poisonous CO-like intermediates and thus enhancing their electrocatalytic activity for methanol oxidation. In particular, the as-prepared ternary Pt3CoPn nanoparticles with branched morphologies exhibit a specific activity and mass activity for methanol oxidation of up to 5.62 mA cm(-2) and 1790 mA mg(-1), respectively, which are 2.3 and 1.1 times those of ternary Pt3CoPn spheres, 4.8 and 1.5 times those of commercial PtRu/C catalysts and surpass those of most Pt-based electrocatalysts reported in the literature. This study thus offers a vivid example to demonstrate the alloying of a transition metal and a non-metal element into active Pt catalysts for improving their electrocatalytic properties.
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